Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 209 insertions, 0 deletions

diff --git a/epan/dissectors/packet-ms-nns.c b/epan/dissectors/packet-ms-nns.c
new file mode 100644
index 0000000..a364dc5
--- /dev/null
+++ b/epan/dissectors/packet-ms-nns.c
@@ -0,0 +1,209 @@
+/* packet-ms-nns.c
+ * Routines for .NET NegotiateStream Protocol (MS-NNS) dissection
+ * Copyright 2020, Uli Heilmeier <uh@heilmeier.eu>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wieshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/*
+ * Basic dissector for .NET NegotiateStream Protocol based on protocol reference found at
+ * https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-NNS/%5bMS-NNS%5d.pdf
+ */
+
+#include <config.h>
+
+#include <epan/packet.h>
+#include <epan/conversation.h>
+
+/* Prototypes */
+void proto_reg_handoff_nns(void);
+void proto_register_nns(void);
+
+static dissector_handle_t gssapi_handle;
+
+
+#define MS_NNS_MESSAGE_HANDSHAKE_DONE      20
+#define MS_NNS_MESSAGE_HANDSHAKE_ERROR     21
+#define MS_NNS_MESSAGE_HANDSHAKE_PROGRESS  22
+
+static const value_string nns_message_id_vals[] = {
+    { MS_NNS_MESSAGE_HANDSHAKE_DONE, "Handshake Done" },
+    { MS_NNS_MESSAGE_HANDSHAKE_ERROR, "Handshake Error" },
+    { MS_NNS_MESSAGE_HANDSHAKE_PROGRESS, "Handshake In Progress" },
+    { 0, NULL}
+};
+
+struct nns_session_state {
+    guint32   handshake_done;
+    gboolean  first_handshake_done;
+};
+
+static int proto_nns = -1;
+static int hf_nns_message_id = -1;
+static int hf_nns_major_version = -1;
+static int hf_nns_minor_version = -1;
+static int hf_nns_auth_payload_size = -1;
+static int hf_nns_auth_payload = -1;
+static int hf_nns_payload_size = -1;
+static int hf_nns_payload = -1;
+
+static gint ett_nns = -1;
+static gint ett_nns_payload = -1;
+
+#define MS_NNS_MIN_LENGTH 4
+
+static int
+dissect_nns(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+    proto_item      *ti, *pti;
+    proto_tree      *nns_tree, *payload_tree;
+    guint           offset = 0;
+    guint32         message_id;
+    guint32         payload_size;
+    conversation_t  *conversation;
+    tvbuff_t        *nt_tvb;
+    gint            remaining;
+    struct nns_session_state *session_state;
+
+    if (tvb_reported_length(tvb) < MS_NNS_MIN_LENGTH)
+        return 0;
+
+    conversation = find_or_create_conversation(pinfo);
+
+    session_state = (struct nns_session_state *)conversation_get_proto_data(conversation, proto_nns);
+    if (!session_state) {
+        session_state = wmem_new0(wmem_file_scope(), struct nns_session_state);
+        conversation_add_proto_data(conversation, proto_nns, session_state);
+    }
+
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "MS-NNS");
+    col_clear(pinfo->cinfo, COL_INFO);
+
+    ti = proto_tree_add_item(tree, proto_nns, tvb, 0, -1, ENC_NA);
+
+    nns_tree = proto_item_add_subtree(ti, ett_nns);
+
+    /* As it is unknown if there is a one-way Handshake Done or a two-way Handshake Done we check the first frame
+     * after the first Handshake Done if it looks like a Handshake Done message (0x140100). */
+
+    if ( session_state->handshake_done && session_state->handshake_done < pinfo->num &&
+            !(session_state->first_handshake_done && tvb_get_ntoh24(tvb, offset) == 0x140100)) {
+        proto_tree_add_item_ret_uint(nns_tree, hf_nns_payload_size, tvb, offset, 4, ENC_LITTLE_ENDIAN, &payload_size);
+        offset += 4;
+        col_append_str(pinfo->cinfo, COL_INFO, "Data");
+        if ( payload_size > 0) {
+            remaining = tvb_reported_length_remaining(tvb, offset);
+            if ((guint32) remaining < payload_size) {
+                pinfo->desegment_offset = offset - 4;
+                pinfo->desegment_len = payload_size - remaining;
+                return (offset - 4);
+            }
+            proto_tree_add_item(nns_tree, hf_nns_payload, tvb, offset, payload_size, ENC_NA);
+            offset += payload_size;
+            session_state->first_handshake_done = FALSE;
+        }
+    }
+    else {
+        proto_tree_add_item_ret_uint(nns_tree, hf_nns_message_id, tvb, offset, 1, ENC_NA, &message_id);
+        offset += 1;
+        col_append_sep_fstr(pinfo->cinfo, COL_INFO, ", ", "%s", val_to_str_const(message_id, nns_message_id_vals, "Unknown Record"));
+        proto_tree_add_item(nns_tree, hf_nns_major_version, tvb, offset, 1, ENC_NA);
+        offset += 1;
+        proto_tree_add_item(nns_tree, hf_nns_minor_version, tvb, offset, 1, ENC_NA);
+        offset += 1;
+        proto_tree_add_item_ret_uint(nns_tree, hf_nns_auth_payload_size, tvb, offset, 2, ENC_BIG_ENDIAN, &payload_size);
+        offset += 2;
+        if ( payload_size > 0) {
+            if ((guint32) tvb_reported_length_remaining(tvb, offset) < payload_size) {
+                pinfo->desegment_offset = offset - 5;
+                pinfo->desegment_len = payload_size;
+                return (offset - 5);
+            }
+            pti = proto_tree_add_item(nns_tree, hf_nns_auth_payload, tvb, offset, payload_size, ENC_NA);
+            if (message_id == MS_NNS_MESSAGE_HANDSHAKE_DONE || message_id == MS_NNS_MESSAGE_HANDSHAKE_PROGRESS) {
+                nt_tvb = tvb_new_subset_length(tvb, offset, payload_size);
+                payload_tree = proto_item_add_subtree(pti, ett_nns_payload);
+                call_dissector(gssapi_handle, nt_tvb, pinfo, payload_tree);
+            }
+            offset += payload_size;
+        }
+        if ( message_id == MS_NNS_MESSAGE_HANDSHAKE_DONE) {
+            session_state->handshake_done = pinfo->num;
+            session_state->first_handshake_done = (session_state->first_handshake_done ? FALSE : TRUE);
+        }
+    }
+    return offset;
+}
+
+void proto_register_nns(void)
+{
+    static hf_register_info hf[] = {
+        { &hf_nns_message_id,
+          { "MessageID", "ms-nns.message_id",
+            FT_UINT8, BASE_DEC, VALS(nns_message_id_vals), 0x0,
+            NULL, HFILL }
+        },
+        { &hf_nns_major_version,
+          { "Major Version", "ms-nns.major_version",
+            FT_UINT8, BASE_DEC, NULL, 0x0,
+            NULL, HFILL }
+        },
+        { &hf_nns_minor_version,
+          { "Minor Version", "ms-nns.minor_version",
+            FT_UINT8, BASE_DEC, NULL, 0x0,
+            NULL, HFILL }
+        },
+        { &hf_nns_auth_payload_size,
+          { "Auth Payload Size", "ms-nns.auth_payload_size",
+            FT_UINT16, BASE_DEC, NULL, 0x0,
+            NULL, HFILL }
+        },
+        { &hf_nns_auth_payload,
+          { "Auth Payload", "ms-nns.known_encoding",
+            FT_BYTES, BASE_NONE, NULL, 0x0,
+            NULL, HFILL }
+        },
+        { &hf_nns_payload_size,
+          { "Payload Size", "ms-nns.payload_size",
+            FT_UINT32, BASE_DEC, NULL, 0x0,
+            NULL, HFILL }
+        },
+        { &hf_nns_payload,
+          { "Payload", "ms-nns.payload",
+            FT_BYTES, BASE_NONE, NULL, 0x0,
+            NULL, HFILL }
+        }
+    };
+
+    static gint *ett[] = {
+        &ett_nns,
+        &ett_nns_payload
+    };
+
+    proto_nns = proto_register_protocol(".NET NegotiateStream Protocol", "MS-NNS", "ms-nns");
+    proto_register_field_array(proto_nns, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+    register_dissector("ms-nns", dissect_nns, proto_nns);
+}
+
+void proto_reg_handoff_nns(void)
+{
+    gssapi_handle = find_dissector("gssapi");
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */